The comparison distribution for a t test for independent means is a t distribution instead of a normal curve because
A) tables are not available for the normal curve.
B) the population variance is estimated.
C) Z distributions were not used at the time the t test for independent means was invented.
D) there are more degrees of freedom for two samples than for one.
B
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Which of the following is considered to be the gold standard for personality disorder assessment?
a. Questionnaire b. Unstructured clinical interview c. Structured clinical interview d. Informant ratings
With respect to arousal level and athletic performance, which of the following statements is FALSE?
a. Arousal level needs to fit the task at hand with some tasks requiring a higher arousal level than others. b. Lowering arousal may be crucial, in order to avoid "choking" during a big event. c. Athletes are able to control their levels of arousal through relaxation and imagery. d. Using a varied routine before athletic performances is beneficial in regulating arousal levels.
Surveys show that since the early 1990s, the percentage of high school students who have engaged in sexual intercourse has been ____________________
Fill in the blank(s) with correct word
Men generally live longer than women
Indicate whether the statement is true or false.